Samsung Electronics Co., Ltd.

Ju-Han Lee

Seung-gi Chang

Nam-Kyoo Park

Uh-Chan Ryu

In-Hwan Kim

Ho-Jeong You

A multi-stage optical amplifier for use in the transmission of optical signals over fiber when using Wavelength Division Multiplexing. Wavelength Division Multiplexing is particularly sensitive to differences in gain between channels and these differences become critical when cascaded fiber amplifiers are used to boost the signal over long distances. The present amplifier flattens the differences in gain and reduces noise figure by using multi-stage equalizing filters along the length of the transmission fiber.

Multi-stage fiber amplifier with flattened gain curves

A high-power and wide-band fiber optic light source including a first rare-earth-doped optical fiber, a second rare-earth-doped optical fiber, an optical coupler coupled between the first and second rare-earth-doped optical fiber for transmitting the input pumping light to the second rare-earth-doped optical fiber, and a pumping light source adapted to supply pumping light, as the input pumping light, to the optical coupler.

High-power and wide-band fiber optic light source

A parallel optical fiber amplifier having a configuration in which a C-band silica-based erbium-doped fiber amplifier (EDFA) stage and an L-band EDFA stage are coupled together in parallel in such a fashion that a reverse amplified spontaneous emission (ASE) light emitted from the C-band and/or L-band EDFA stage is reused as a secondary pumping source for an amplification in the L-band EDFA stage. In the optical fiber amplifier of the present invention, the reverse ASE light emitted from the C-band EDFA stage and the reverse ASE light emitted from the L-band EDFA stages supplied to the L-band EDFA stage so that they can be reused for improving the power conversion efficiency of the entire system and for reducing the noise factor thereof.

Parallel optical fiber amplifier with high power conversion

A long-band optical fiber amplifier with enhanced power conversion efficiency including a first optical fiber part provided with a pumping light source, a second optical fiber part connected with the first optical fiber part, the second optical fiber part being not provided with the pumping light source, and a reuse circuit coupled between the first optical fiber part and the second optical fiber part for utilizing amplified spontaneous emission (ASE) as a secondary pumping light source from the first optical fiber part. Preferably, the reuse circuit comprises a WDM coupler connected between the first and second optical fiber parts, and a light pumping device connected with the WDM coupler to provide the pumping light source. The first and second optical fiber parts consist of erbium-doped optical fiber, and the erbium-doped optical fiber is adjusted so as to produce a gain in the L-band.

Growing community of inventors

Suwon-shi, South Korea

Ju-Han Lee